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		<h1>[name]</h1>

		<div class="desc">Implementation of a <a href="http://en.wikipedia.org/wiki/Quaternion">quaternion</a>. This is used for rotating things without encountering the dreaded <a href="http://en.wikipedia.org/wiki/Gimbal_lock">gimbal lock</a> issue, amongst other advantages.</div>


		<h2>Example</h2>

		<code>var quaternion = new THREE.Quaternion();
		quaternion.setFromAxisAngle( new THREE.Vector3( 0, 1, 0 ), Math.PI / 2 );

		var vector = new THREE.Vector3( 1, 0, 0 );
		vector.applyQuaternion( quaternion );
		</code>


		<h2>Constructor</h2>

		<h3>[name]( [page:Float x], [page:Float y], [page:Float z], [page:Float w] )</h3>
		<div>
		x - x coordinate<br />
		y - y coordinate<br />
		z - z coordinate<br />
		w - w coordinate
		</div>


		<h2>Properties</h2>

		<h3>.[page:Float x]</h3>

		<h3>.[page:Float y]</h3>

		<h3>.[page:Float z]</h3>

		<h3>.[page:Float w]</h3>


		<h2>Methods</h2>

		<h3>.set( [page:Float x], [page:Float y], [page:Float z], [page:Float w] ) [page:Quaternion]</h3>
		<div>
		Sets values of this quaternion.
		</div>

		<h3>.copy( [page:Quaternion q] ) [page:Quaternion]</h3>
		<div>
		Copies values of *q* to this quaternion.
		</div>

		<h3>.setFromEuler( [page:Vector3 vector] ) [page:Quaternion]</h3>
		<div>
		Sets this quaternion from rotation specified by Euler angles.
		</div>

		<h3>.setFromAxisAngle( [page:Vector3 axis], [page:Float angle] ) [page:Quaternion]</h3>
		<div>
		Sets this quaternion from rotation specified by axis and angle.<br />
		Adapted from [link:http://www.euclideanspace.com/maths/geometry/rotations/conversions/angleToQuaternion/index.htm].<br />
		*Axis* have to be normalized, *angle* is in radians.
		</div>

		<h3>.setFromRotationMatrix( [page:Matrix4 m] ) [page:Quaternion]</h3>
		<div>
		Sets this quaternion from rotation component of *m*.
		Adapted from [link:http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToQuaternion/index.htm].
		</div>

		<h3>.inverse() [page:Quaternion]</h3>
		<div>
		Inverts this quaternion.
		</div>

		<h3>.length() [page:Float]</h3>
		<div>
		Computes length of this quaternion.
		</div>

		<h3>.normalize() [page:Quaternion]</h3>
		<div>
		Normalizes this quaternion.
		</div>

		<h3>.multiply( [page:Quaternion b] ) [page:Quaternion]</h3>
		<div>
		Multiplies this quaternion by *b*.
		</div>

		<h3>.multiplyQuaternions( [page:Quaternion a], [page:Quaternion b] ) [page:Quaternion]</h3>
		<div>
		Sets this quaternion to *a x b*<br />
		Adapted from [link:http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/code/index.htm].
		</div>

		<h3>.multiplyVector3( [page:Vector3 vector], [page:Vector3 dest] ) [page:Quaternion]</h3>
		<div>
		Rotates *vector* by this quaternion into *dest*.<br />
		If *dest* is not specified, result goes to *vec*.
		</div>

		<h3>.clone() [page:Quaternion]</h3>
		<div>
		Clones this quaternion.
		</div>


		<h2>Static methods</h2>

		<h3>.slerp( [page:Quaternion qa], [page:Quaternion qb], [page:Quaternion qm], [page:Float t] ) [page:Quaternion]</h3>
		<div>
		Adapted from [link:http://www.euclideanspace.com/maths/algebra/realNormedAlgebra/quaternions/slerp/].
		</div>


		<h3>.slerp([page:todo qb], [page:todo t]) [page:todo]</h3>
		<div>
		qb -- todo <br />
		t -- todo
		</div>
		<div>
		todo
		</div>

		<h3>.toArray() [page:todo]</h3>
		<div>
		todo
		</div>

		<h3>.equals([page:todo v]) [page:todo]</h3>
		<div>
		v -- todo
		</div>
		<div>
		todo
		</div>

		<h3>.lengthSq() [page:todo]</h3>
		<div>
		todo
		</div>

		<h3>.fromArray([page:todo array]) [page:todo]</h3>
		<div>
		array -- todo
		</div>
		<div>
		todo
		</div>

		<h3>.conjugate() [page:todo]</h3>
		<div>
		todo
		</div>

		<h2>Source</h2>

		[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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